--- Gnu-Mach/include/device/net_status.h	2020/09/02 04:36:57	1.1.1.1
+++ Gnu-Mach/include/device/net_status.h	2020/09/02 04:45:35	1.1.1.3
@@ -1,25 +1,25 @@
-/* 
+/*
  * Mach Operating System
  * Copyright (c) 1991,1990,1989 Carnegie Mellon University
  * All Rights Reserved.
- * 
+ *
  * Permission to use, copy, modify and distribute this software and its
  * documentation is hereby granted, provided that both the copyright
  * notice and this permission notice appear in all copies of the
  * software, derivative works or modified versions, and any portions
  * thereof, and that both notices appear in supporting documentation.
- * 
+ *
  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
- * 
+ *
  * Carnegie Mellon requests users of this software to return to
- * 
+ *
  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  *  School of Computer Science
  *  Carnegie Mellon University
  *  Pittsburgh PA 15213-3890
- * 
+ *
  * any improvements or extensions that they make and grant Carnegie Mellon
  * the rights to redistribute these changes.
  */
@@ -72,6 +72,7 @@ struct net_status {
 
 #define	NET_DSTADDR		(('n'<<16) + 3)
 
+#define	NET_FLAGS		(('n'<<16) + 4)
 
 /*
  * Input packet filter definition
@@ -83,7 +84,7 @@ struct net_status {
  *  We allow specification of up to NET_MAX_FILTER (short) words of a filter
  *  command list to be applied to incoming packets to determine if
  *  those packets should be given to a particular network input filter.
- *  
+ *
  *  Each network filter specifies the filter command list via net_add_filter.
  *  Each filter command list specifies a sequences of actions which leave a
  *  boolean value on the top of an internal stack.  Each word of the
@@ -94,10 +95,15 @@ struct net_status {
  *  top two elements of the stack and replaces them with its result.  The
  *  special action NOPUSH and the special operator NOP can be used to only
  *  perform the binary operation or to only push a value on the stack.
- *  
+ *
  *  If the final value of the filter operation is true, then the packet is
  *  accepted for the filter.
- *  
+ *
+ *  The first filter_t object is a header which allows to set flags for the
+ *  filter code. Main flags concern the direction of packets. This header is
+ *  split in the same way NETF words are : the 6 MSB bits indicate the type
+ *  of filter while the 10 LSB bits are the flags. For native NETF filters,
+ *  clear the 6 MSB bits (which is why there is no dedicated macro).
  */
 
 typedef	unsigned short	filter_t;
@@ -112,6 +118,14 @@ typedef filter_t	*filter_array_t;
 #define	NETF_ARG(word)	((word) & 0x3ff)
 #define	NETF_OP(word)	(((word)>>NETF_NBPA)&0x3f)
 
+/*  filter types  */
+#define NETF_TYPE_MASK	(((1 << NETF_NBPO) - 1) << NETF_NBPA)
+#define NETF_BPF	(1 << NETF_NBPA)
+
+/*  flags  */
+#define NETF_IN		0x1
+#define NETF_OUT	0x2
+
 /*  binary operators  */
 #define NETF_NOP	(0<<NETF_NBPA)
 #define NETF_EQ		(1<<NETF_NBPA)
@@ -131,7 +145,6 @@ typedef filter_t	*filter_array_t;
 #define	NETF_RSH	(15<<NETF_NBPA)
 #define	NETF_ADD	(16<<NETF_NBPA)
 #define	NETF_SUB	(17<<NETF_NBPA)
-#define NETF_BPF	(((1 << NETF_NBPO) - 1) << NETF_NBPA)
 
 
 /*  stack arguments  */
@@ -178,10 +191,11 @@ struct net_rcv_msg {
 	char		header[NET_HDW_HDR_MAX];
 	mach_msg_type_t	packet_type;
 	char		packet[NET_RCV_MAX];
+	boolean_t	sent;
 };
 typedef struct net_rcv_msg 	*net_rcv_msg_t;
 #define	net_rcv_msg_packet_count packet_type.msgt_number
 
 
 
-#endif	_DEVICE_NET_STATUS_H_
+#endif	/* _DEVICE_NET_STATUS_H_ */